1 /* Copyright (c) 2012 The Chromium OS Authors. All rights reserved. 2 * Use of this source code is governed by a BSD-style license that can be 3 * found in the LICENSE file. 4 */ 5 6 /* These header files need to be included before asm/siginfo.h such that 7 * pid_t, timer_t, and clock_t are defined. */ 8 #include <stdlib.h> 9 #include <unistd.h> 10 11 #include <asm/siginfo.h> 12 #define __have_siginfo_t 1 13 #define __have_sigval_t 1 14 #define __have_sigevent_t 1 15 16 #include <signal.h> 17 #include <string.h> 18 19 #include "signal_handler.h" 20 21 #include "util.h" 22 23 struct local_sigsys { 24 void *ip; 25 int nr; 26 unsigned int arch; 27 }; 28 29 void log_sigsys_handler(int nr, siginfo_t *info, void *void_context) 30 { 31 struct local_sigsys sigsys; 32 const char *syscall_name; 33 memcpy(&sigsys, &info->_sifields, sizeof(sigsys)); 34 syscall_name = lookup_syscall_name(sigsys.nr); 35 36 (void) void_context; 37 38 if (syscall_name) 39 die("blocked syscall: %s", syscall_name); 40 else 41 die("blocked syscall: %d", nr); 42 43 /* 44 * We trapped on a syscall that should have killed the process. 45 * This should never ever return, but we're paranoid. 46 */ 47 for (;;) 48 _exit(1); 49 } 50 51 int install_sigsys_handler() 52 { 53 int ret = 0; 54 struct sigaction act; 55 sigset_t mask; 56 57 memset(&act, 0, sizeof(act)); 58 act.sa_sigaction = &log_sigsys_handler; 59 act.sa_flags = SA_SIGINFO; 60 61 sigemptyset(&mask); 62 sigaddset(&mask, SIGSYS); 63 64 ret = sigaction(SIGSYS, &act, NULL); 65 if (ret < 0) 66 return ret; 67 68 ret = sigprocmask(SIG_UNBLOCK, &mask, NULL); 69 if (ret < 0) 70 return ret; 71 72 return 0; 73 } 74
